The Black Flag Fog Juice comes in different size containers. On the side of the Fogger, there is a cap that un-screws and you pour the fog juice in. On the back side of the fogger there is an opening that you screw in a 1lb. propane cylinder into. Turn on the propane, hit the ignition switch to ignite the unit. The internal burner assembly will heat up the fogger coil, you need to let the unit heat up for about 2 minutes, walk around the campsite and press the trigger to blow out the fog. It really works good, my cousin has a unit and has brought it to the last two campouts. So Chris and I went to Lowe's and picked up a unit for ourselves.